C-Glycosidations of a 2-Ketohexosyl Bromide with Electrophilic, Radical, and Nucleophilic Anomeric Carbons
作者:Frieder W. Lichtenthaler、Matthias Lergenmüller、Sabine Schwidetzky
DOI:10.1002/ejoc.200300152
日期:2003.8
susceptibility of acylated 2-ketohexosyl halides to C-homologation is demonstrated with the easily accessible tri-O-benzoyl-α-D-arabino-hexos-ulosyl bromide 1 as the model compound. C-Glycosidation with an electrophilic anomeric carbon requires prior carbonyl protection, to avoid carbonyl addition by the C-nucleophile, for example, as the cyanohydrin. Silver triflate-promoted reaction with the silylenol ether of